Ments



(No Model.)

W. HOLZEBJ. BLEGTRIU LAMP.

No. 264,698. Patented Sept. 19, 1882.

N. PETERS. Pmlvumo ra mt Wishing'tnn. D. C.

UNITED STATES I PATENT OFFICE.

WILLIAM HOLZER, OF MENLO PARK, N. J., AS SIGNOR, BY MESNE ASSIGN- MENTS, TO THE EDISON ELECTRIC LIGHT COMPANY, OF NEW YORK, N. Y.

ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 264,698, datedSeptember 19, 1882.

' Application filed November 28,1881. Renewed August 14, 1882. (Nmodel.)

To all whom it may concem:

Be it known that I, WILLIAM Homes, of Menlo Park, in the county ofMiddlesex and State of New Jersey, have invented a new and usefulImprovement in Electric Lamps and I do hereby declare that the followingis a full and exact description of the same, reference being had to theaccompanying drawings, and to the letters of reference marked thereon.

My invention relates to those incandescent electric lamps in which theincandescent cond uctor is inclosed in a hermetically-sealedvacuum-chamber made entirely of glass, and itis intended as animprovement on the lamps described in the patents of Thomas A. Edison,Nos. 230,255 and 239,149. These lamps are made in two parts-the exteriorinclosing globe and an intcriorstem, which enters said globe and acts asa support for the wires which convey the electric current to and fromthe incandescing conductor. The interior stem is a tube of glass, inwhich the wires are laid, the inner end ofthe tube being closed. and thewires passing through and being sealed into the glass which closes it.

In the above-mentioned patents the inner end of the tube is formed intoa spherical, or nearly spherical, bulb, through the glass of which thewires pass. They are thus in contact with the glass for a very smallportion only of their length-equnl to the thickness of the glass.

I have found it desirable to increase the extent of this contact withthe glass, in order to lessen the liability of cracking at the point ofcontact between the wire and glass, and to hold the wires morefirmly inplace. To do this, after the wires are passed through the tube I heatthe inner end of the latter to a welding heat and then press the endtogether upon the wires, so that a small flat piece is produced, withinwhich the wires are firmly held, they being in contact with the glassthroughout the entire length of the flat portion of the tube. This maybe better understood by reference to the annexed drawings,in which-Figure 1 is a view partly in elevation and partly in section of anentire lamp containing my invention, and Fig. 2 is a view of the inte-5o rior glass stem or wire-support.

A is the inclosing globe or vacuum-chamber, made of glass; and B, theinterior stem or wiresupport, which is made from a hollow tube of glass,open at both ends. In such a tube the copper conducting-wires 1 2 arelaid, a bulb having been previously blown at b I) to form a shoulder towhich theglobe is to be secured. The upper end of B is then heated by ablowpipe flame to a welding condition, when its sides are compressedand, welded together by means of any suitable instrument, so that asolid flat portion, a, is formed around the wires 1 2. The incandescingconductorG is then attached, in any suitable manner, tothe wires12,after which the stem B is introduced into the globe A, and the two-aresealed together at the points I) I) by the fusion of the glass. The lampis exhausted and sealed off at c, and is then ready for use.

What I claim is- 1. In an incandescing electric lamp, the central tubeor support formed with a solid fiat portion at its upper extremity,through which the leading-in conductors pass and in 7 which they aresealed, substantially as set forth.

2. The method of sealing theleading-in conductors into the centraltubular carbon-support of an incandescing electriclamp, consist- 8o ingin squeezing the open upper end of the tube upon such conductors, and atthe same time closing air-tight such end of the tube, substantially asset forth.

This specification signed and witnessed this 27th day of September,1881.

ILL [AM HOLZER.

Witnesses B10111). N. DYER, H. W. SEELY.

